Insulating-strain.



No; 859,703, PATENTE@ JULY 9, 1907.

L. ST ERGER.

INSULA STRAIN. PPPP IOATION FILED MAY 1. 1906.

EEEEEEEEEEEEE 2 r.Louis sfrsmnnnenn,

PATENT OFFICE.

OF NEW YORK, N. Y.

IN)SULAfrING-STRAIN.

Specification of Letters Patent.

Patented July 9, 1907.

Application filed May 1, 1906. Serial No. 314,642.

To all whom it 'may concern:

Be it known that '1, LOUIS STEINBERGER, a citizen of the hUnited States,and a resident of the city of New York, borough of Brooklyn, in the'county of Kings and State of New York, vhave invented a new andlmproved Insulating-Strain, of which the following is a full, clear, andexact description.

My invention relates to insulating strains for the support andinsulation of electric conductors and more especially for use inconnection with currents of high voltage. v l My more particular objectsare to so improve the insulation as to lessen the tendency, under wetWeather or other unfavorable conditions, of a high voltage current toarc over the surface of the insulator, and also to have the insulatoract as a turn-buckle vwhen so desired. I

Reference is to be had to the accompanying draw- -ingsforming a part ofthis specification, in which I ing the'disposition of the hoodsrelatively thereto; and Fig. 3 is a central section through thc strain,parts,

however, appearing in elevation.

A. 'disk ,4 of insulating material, is made smooth upon its uppersurface and is provided upon its lower vsurface with a plurality ofannular concentric hoods or petticoats 4, said disk being furtherprovided 'at its outer edge with projections 4b spaced apart andservingas drip edges. Integral with the disk 4 is an upper neck 5provided with annularhoods 6 superposed one over the other. Alsointegral with the disk 4 is a lower neck 7 0f substantiallyfrusto-conical form and provided with annular petticoats 8. The lowerend 9 of the frusto-conical portion 7 is preferably left thick as shown.A link 1D of metal, having the form of a longitudinal rod, is embeddedwithin the portion 7 and is provided at its lower end with a head 11.Another link 12 which is ofendles's form, is provided with a swivel ring13 integral therewith, this ring encircling the longitudinal link 10.The upper end of the link 10 terminates in a head 14 which affords anexcellent anchorage within the lower neck 7 of insulating material. A.metallic sleeve l5, threaded internally', is provided at its lower endwith a head 16 and is embedded within the upper neck 5 so that the head16 reaches to a point comparatively deep within the disk ll, thusaffording` a good anchorage. A screw l? is provided with a thread lS andterminates in an eye 19. This screw is fitted into the sleeve 15, andwhen turned by means of the eye 19 virtually lengthens or shortens thestrain.

It will be observed that both the heads 14 and 1G,

the disk 4 is thicker at the points adjacent to its middle than at itsedges.

The annular steps or hoods 6 prevent the accumulation of moisture uponthe upper stem 5, for the reason that although the lower edges of thesehoods may bccome moistened the moisture cannot'present an unbrokensurface and the danger of arcing is thus greatly diminished. My purposein rendering the disk -i smooth upon its upper side is to prevent theretention thereupon of moisture, soot, dust, ashes, etc. This object isiurther promoted by inclining the upper surface. l find that theprojections 4b facilitate the dripping ci moisture from the uppersurface of the disk, and also tend tovprevent the drifting oi moistureto the underside of the disk. The annular petticoats 4 not only break upthe under surface of the disk, and increase the creeping surface, butalso subject theqnoisture to such environment that in order to creepinwardly toward the center from the edges of the disk the moisture mustfollow'a path which leads upwardly, and this effectively prevents thecreeping oi the moisture. This conformity also increases the surfaceacross which surface leakage might occur. The frusto-conical portion 7being smaller at its bottom than at its top, has tendency to shield itsbottom from moisture, and the moisture accumulating upon any part ofthis body portion is caused to drip therefrom by the action of thepetticoa-ts 8; By turning the insulator the strain periorms the functionof a turnbuckle.

I do not limit myself to the use of any prescribed materials; I prefer,however, to employ the insulating material'knowniin the art aselectrose.. Nor do l limit myself to an insulator constructed exactly asshown, nor to the exact form of either of the separato portions, neitherdo l limit myseli to any particular combination of these parts, nor toemploy in every instance the turnbuckle feature, for the reason thatvariations may beiiinade by those skilled in the art without departingfrom the spirit or scope oi my invention.

Having thus described my invention, I claim as new and desire to secureby Letters Patent:-

1. An insulating strain, comprising a disk-like member having a. neckintegral therewith, said disk-like member and said neck being' ofinsulating material, a metallic sleeve extending entirely through saidneck and having a head embedded within said disk-like portion, ametallic member connected with said disk-like member at a point oppositesaid sleeve, and a supporting member provided with an eye and engagingsaid sleeve.

2. An insulating strain, comprising a body portion lmvine; adjacent toits middle a disk provided with a plurality of annular petticoa tsdisposed concentrically in relation to each other, said body portionbeing further provided with necks each having a step conformity, andstrain members connected with said necks.

3. As an article of manufacture, an insulating strain comprising aportion having :i wide middle, and terminating in angular surfaces forfacilitating theA dripping of moisture, said portion having also aplurality of necks, one of said necks being provided with petticonts,and a .strain member embedded within said last-mentioned neck.

4. As an article of manufacture, an insulating strain comprising adisk-like member of insulating material having a thick middle portiontapering toward its peripheral edge, a metallic strain member embeddedwithin said disklike member and having a portion extending therefrom,and a second metallic strain member connected with said disk-like memberat a point opposite said first mentioned strain member.

5. An insulating strain, comprising a disk of insulating materialhavinga neck integrati therewith, a metallic strain member partiallyembedded within said neck and extending therefrom, and another metallicmember connected with' said disk at :i point opposite saidfirst-mentioned strain member.

l6. Aninsulating strain, comprising a disk oi' insulating materialprovided with a body portion and with neck portions lntegral therewith,the plane of said disk being :it right angles to the general directionotextension of said neck portions, a metallic strain member embedded ineach of said neck portions and extending therefrom, in the guireraldirection of said neck portions.

7. An insulating strain, comprising a disk-like portion comparativelythick at its middle and.tlin at its edges. said disk-likeportio'n beingprovided with necks integral therewith, a fastening member embeddedwithin euch o1' said. necks and one of said fastening members extendingentirely through one of said necks and being provided with a headdisposed toward the center of said disk-lilal member, the other of saidfastening members being disposed :it a point opposite saidlast-mentioned fastening member.

In testimony whereof I have signed my naine to this specification in thepresence of two subscribing witnesses.

LOUIS STEINBERGICR.

Witnesses z WAI/rox Hannisox, Evi-:kann D. MARSHALL.

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